Environmental protection

Описание:

Problem of contamination of nature in connection with activity of man. Air's and water's pollution. Garbage as the main reason of pollution of cities. Influence of radiating radiations on people and animals. Value of preservation of the environment.

Параметры файла:

Рубрика: Экология и охрана природы

Добавлено: 13.12.2011 08:26:04

Просмотры: 90

Тип: презентация

Язык: английский

Размер: 1,4 M